Draft and damper control



Nov. 7, 1933. L. M. PERSONS DRAFT AND DAMPER CONTROL Filed Sept. 19,1930 2 Sheets-Sheet l Z f7? Vewfar [aarezzcaJKfiwwa Nov. 7, 1933. L. M.PERSONS 1,933,929

DRAFT AND DAMPER CONTROL Filed Sept. 19, 1930 2 Sheets-Sheet 2 2 a 6 ifFigure 2 is a section on the line 22 of Figure 1;

Figure 3 is a sectionvon the line 33 of Figure 2; and i diagram ofFigure 4. i

Patented Nov. 7, 1933 UNITED STATES 1,933,929 DRAFT AND DAMPER CONTROL-Laurence M. Person's, St. Louis, Mo.,ass'ign'or to Emerson ElectricManufacturing 00., Mo., a corporation of Missouri St. Louis,

Application September 19, 1930 Serial No. 482,975 I 10 Claims. o1.23616) My invention relates to actuating means for a draft control, andhas for one object to provide draft control means which shall bethermostatically responsive, normally, to temperature, but which may bevinterrupted temporarily to permit an operator to stoke the furnace,without permanently interrupting the normal thermostat control. Oneobject is the provision of control means which may be motor actuated inone direction and spring actuated in the other. Otherobjects will appearfrom time to time in the course ofthe specificationand claims.

I illustrate my invention more or less diagrammatically in theaccompanying drawings,

wherein v Figure l is a front elevation;

Figure 4 is a wiring diagram. Like parts are indicated by likethroughout the specification and drawings.

mounted. A generally indicates a base structure, herein shown as ofsheet metal. Mounted upon the base A is a housing member which mayinclude the bottom A the front N, the top A and removable sides A Agenerally indicates a supplemental housing, also mounted on the member Ain which is positioned any suitable transformer A 'the details of whichform no part in themselves of the present invention. It may include theprimary coil A and the secondary A as shown in the wiring Positionedupon the base A and within the housing structure A A A is the controlassembly which includes the plates B B which may be connected to eachother as by the spacers 13 the inner ends of which may be secured as bythe nuts I?! to the baseA the outerends having secured thereto the nutsB whereby the assembly is locked together and positioned upon the base ARotatably mounted, for example in the bear ings C C is the shaft/C whichextends outwardly through an aperture'A in the housing member A theaperture being of suificient. size- C and provided with a recurvedcylindrical flange C Interposed with the enlargement G4 I and the plateB is the coil spring C one end of which is locked as at C in'the plate Bthe room symbols Referring to the drawings, A generally indicates asupporting surface panel or the like" upon which the device hereindescribed may be other to the pin C 'on the enlargement C as shown inFigure 3. Exterioriy of the sleeve C the shaft C is reduced in diameteras at C and further reduced as at C preferably square in cross-section.Upon these two reduced portions are positioned the levers C andC'respectively. The lever C is i'otatably mounted upon the shaft, and thelever C is fixed against rotation in relation'to the shaft. C is awasher orspacer fixed in relation to the lever C and C is an exteriorwasher at the end of the shaft which holds the assembly in position,being con upon which are the plurality of pins C the function of whichwill later appear. The hub portion of the lever C and the connectedspacer C are both apertures as at C in line with the pins C i Mounted onthe expansion C are three pins C which may penetrate the aperturesC Whenthey do, they look the levers @0 and C against relative rotation. Thespring C normally thrusts the sleeve C and its enlargement C in suchdirection as to keep the pins 0 in looking position. The spring has thefurther function of imparting to the lever C when released a clockwisemovement. referring to the parts in the position in which they are shownin Figure 1. An inward thrust upon the cup or push button C causes thepins C to thrustagainst the'pins C and to push them far enough torelease the lever C and to permit the spring C to rotate it to thedotted shaft D which is supported in any suitable bearings. On the endof the shaft' D which extends exteriorly of the plateB is a gen-"er-ally circularmember 13?, having a lug or off jset D extendingoutwardly from, its periphery.

Mounted loosely on the shaft D is an arm D which'has an-oii-set Dadapted'to be opposed finedby the shoulder of the screw C Slidably tothe off-set D D is a rather powerful coil spring, one end of which issecured tothe outer j end of the arm D the other being anchored as at Dupon the plate 13 i Held against rotation in relation to the shaft D isthe gear D in mesh with a pinion E on the shaft E Mounted uponthe'shaft-E is thespiral spring E mounted upon the drum E E is'a gear'EFin mesh with a pinion H upon gear H2 in mesh with a pinion H upon theshaft H.

The shaft H carries a gear H in mesh with the pinion J upon the shaft JThe shaft J 5 serves as the motor shaft of a static torque mp tor, thearmature of which is indicated as at J, the field being indicated as at.T-k Further mounted on the shaft J is a. centriiugal. seven. norstructure including the springs JF-jwith, the weights J and the breakdrum or track JPQ It will be understood that a rotation of the motorshaft above a predetermined speed bri s fthe ends of the spring J incontact with the oak drum or track, thus preventing furtherkapgelera;tion. It will be understood that the eld J of the. static. torque. motoris.v mounted: upon and. held against rotation. bitsomo otthe. bolts. orspacers. B?

Mounted adjacent theshattfi unonth late o B is. an insulating block. Kurn. which-is. mounted. a. sprin eaf Khat. the-end; of. which. is, acontact. plate! The-swi dl K is. normally out or Contact. w th theplate. but; a m mber K3 "is... p vi d; inte me ia e he; n s. wot thasnrns e of: su etine matefiakwhichis. opp sed. o. he. m, f he lan t will:be. under tq dmet; hen. he cup. r u ton. smwst. er i he ieh ia riosiqithei o ion. Q1 hea s as o nia su e 2, a ages. he. n ula ee lac r. ndiexfl he:

91 18 K3 a d; hu doses. he Switch.

Re g. o h wine. a r m. f swe. L dieera a isa lr mit tes. mt u ab ehermes es nr erob r s n ns e. be. eam emn r e sa e It 11 .c cui n ludmebe n to hi h. xi sli wsh h ta ic torque motor J? J? to. oneend. oftheseoondary-coil A or thetransformer. LE. indicates a return con.-qstioair m the p s e nd. of. the co A9 tothethermostahh, Shuntedacrossthe circuit.

so formed is. a, conductor, Li. in which. is, the above described switchK} with. its. opposed. contact; plate. K". L L are. condu tive lines,adapted. to actuatethe pimary A of the transformer, I

I av l trate m flvit t ni he ormin i h t be app ied mntroithe; dra t of.a furnace, although, I do ,notllwish .to, limit my lH sne i use r p icaton have. illustrated, however. flexible. connections. M t ad e mm hlevers C. a d. C? res o: tively.. The. connection. M. may. extend to thecheck, oii.a.furnace and the connection M to. the .draft. The furnace.structure is notv shown, hereinjsince it.does not of itself form part ofthe present invention.

1% will be. realized that whereas I. have descrife d and shown apractical and operative device, that nevertheless I may make manychanges in size, shape, number and disposition of. parts] withoutdeparting from the spirit of my "present invention. I wish my drawings,therefore, and my-description to .be taken asin a broad senseillustrative. or diagrammatic, rather than as limiting me to the.specific struc-. ture herein shown, or to aspecific application tofurnace draft control.

Thenseandoperation of. invention are. as, follows;

It illustrate. a... cont o d v e: partic la ly. adapted to. impart nteitt ntmotion o. an le, rality of controlelemeots. an .rar eu e vadapteed or. use in a mit n r r esu etenIon a rnac her in om tic. er s at 1 nno. tt me t rup ed; ei r ne; tm ea front view, the arm C is shown indraft closing position, and, the lever C is shown in full line in checkopening position. The room thermostatL actuates the motor J J Upon apredetermined drop in temperature, the thermostat will close the motorcircuit and cause the armature J 'to rotate and thereby rotate theentire assembly throughthe chain of gears above described.. SW13.rotation will continue until the pqsition oi the two. arms is reversed,and until the arm C is in the dotted line position againstthe stop C. Atthe same time the lever C" will descend to dotted line position. Thestop Q will prevent any further rotation and will stall the motor.However, during the brief rotation one effect of. the driving of thechain of gearsisto wind up the spring E during: the processrof. openingthe draft and closing the check. This. spring. is. positioned interme--diate the endsiof the gear train which. limits the eating up, of. powerby a frictional loss in gear. transmission. In thenormal; operation ofthe device- .when1 the. temperature again. rises. the: motor circuit.is. cut, oil: and: the spring E is. then. able to impart a.retrogradmrotationto the. motor armaturet. During the timethe motor istalled. a ainst; the .stopiit resists movement or the spring even thoughthe armature is notableto .r otate, owing to the. interference of thestop.

Assume. that. the operator Wishes to stoke: the furnace when the partsare in the position shown in the drawings. the cheok.being openedandythadraft closed... The. pressure on.,.the.button C17 will thrust thepins C18 through; then pertures. C and. against. the. pins. c per.-mitting the spring C6 to rotate the lever: C into the dottedlinenositionuotfignre 1.. closing he heck. When the clutch is. thusactuated the motor. aotuatins circuitia al sedindependent of. the,position; of. the mount thermostat, batheclqsurei of. me uring. Klthrough. he lwaeementof thefiange, c with; the inlatins blocmKiontheswitchleafi prinz K... he moto hm-.. wates. to rotate the draft rm.ino.. noncp sition.- When it eachesonen posit on-i 1snar s nt neaaomentwithitheclutch o;. that the tw arms. are. a ain; perable a a nit... Thipnens he-m ton circui in the ev nt hat. he. herm st tpoi cuit is. open,and. t e evioer tu nsto. ho d a t osed hock p ned p sit on. et rademovement. bein impor d. y. mansioirthel lo ksnrme h c ntrol evers; re;norma ly! eldi in. this. p sition, the motor, if actuated by, means of.the room thermostat la rumiinflhuntil.the lever C11 a es; he., ton. in.Cth u r r d y. hec posedabutments. D1 D the. shr ne. D acting;.. as-; a;buffer spring; When the. room thermostat breaks thmmot r circuitinresponse QLa L Qi'. in, temperature, the motor then no n er. op oses.e: ction o the; clock sprin andsthepri has eta ned fi cient p we v torotate the gear train until it stalls against the buffer abovedescribed, and returning. the draft arn; to closed position and the:chcck 'arm toppenposition. The governor, which includes the springs J?and.-.the-d.rum.-J .,.has for a.

function to prevent. thev motor from racing when 'it ismovedjnresponseto the-thrust of. the.

pr n E? 'lflhe motorr mam-haven. normal synchronous eedn sihig nesi iiwR L ot'it' ay be held downtqsay 700 P. M. byrthe governor, ecau enof thelement required, i l thao eration ;of,.the zaboveidesoribed clutch andcontrol mechanism. The full movement may, for example, be about 4minutes. Assume that the parts are in the position shown in the drawingsand the operator actuates the button or clutch mechanism to permit thecheck lever to rise, it may take, say 2 minutes for the motor to returnthe draft arm to open position. It will then engage with the check armand the entire assembly will begin to rotate in the opposite direction.One-half to three-quarters ofa minute of the return time may benecessary to take up the slack of the flexible check control connectionM. The rotation is then completed with the check fully opened and thedraft closed. This time is ample to permit the operator to open the doorof the furnace and supply a charge of fuel and close the door and go onhis way, it being necessary for him to pay no attentiton whatsoever tothe controls, except for his initial clutch operating pressure againstthe button C".

I claim:

1. In combination, work performing members and control means, saidcontrol means including a motor, a rotor for said motor, a gear trainadapted to be driven by said rotor, controlled means associated with thegear train and work performing members and adapted to be rotated by saidgear train and additional rotary motor means adapted to drive said geartrain in a direction of rotation opposite to that imparted to it by saidfirst mentioned motor.

2. In combination, work performing members and control means, saidcontrol means including a static torque motor and an actuating circuittherefor, a rotor for said motor, controlled means associated with saidwork performing members and a driving connection between said means andthe rotor, and additional rotary motor means adapted, when the actuatingcircuit of the motor is broken, to impart a retrograde movement to saiddriving connection, and stop means adapted to limit the movement of saidcontrolled means in response to actuation of the static torque motor.

3. In combination, work performing members and control means, saidcontrolmeans including a static torque motor and an actuating circuittherefor, a rotor for said motor, controlling arms and a drivingconnection between said arms and the rotor, and additional motor meansadapted, when the actuating circuit of the motor is broken, to impart aretrograde movement to said driving connection, and resilient means 1for stalling said motor after a predetermined movement of thecontrolmeans.

4. In combination, work performing members and control means, saidcontrol means including a static torque motor and an actuating circuittherefor, controlling arms and a driving connection between said armsand'the motor, and additional motor means adapted, when the actuatingcircuit of the motor is broken, to impart a retrograde movement to saiddriving connection, and means for stalling said motor after apredetermined movement of the control means, including a spring adaptedto resist further movement of said driving connection.

5. In combination, work performing members and control means, includinga motor, controlling arms and a gear train intermediate said motor andarms, and additional motor means, positioned intermediate the ends ofsaid gear and a train,- adapted to impart a retrograde movestaticactuation, which includes one or more work performing members, a statictorque motor and an actuating circuit therefor, thermostatic controlmeans in said circuit, additional means for making and breaking saidcircuit independently of the actuation of the thermostatic meansincluding a clutch and manual means for operating it, an operatingmember or members for said work performing member or members, and adriving connection between such work performing'member or members andthe rotor of the motor, resilient means for stalling the motor when saidmember or members reach a prede termined position, and means forimparting retrograde movement to the operating members upon the breakingof said motor circuit.

8. A control mechanism adaptedfor thermostatic actuation which includesone or more work performing members, a static torque motor and anactuating circuit therefor, thermostatic control means in said circuit,additional means for making and breaking said circuit independently ofthe actuation of the thermostatic means including a clutch and manualmeans for operating it, an operating member or members for saidworkperforming member or members, driving connection between such workperforming member or members andthe rotor of the motor, resilient meansfor stalling the motor when said member or members reach a predeterminedposition, and means for imparting retrograde movement to the operatingmembers upon the breaking of said motor circuit, including a springmotor opposed to said electric motor.

9. In combination, work performing members and control means,saidcontrol means including a motor, a rotor for said motor, a geartrain adapted to be driven by said rotor, controlled means associatedwith the gear train and work performing members adapted to be rotated bysaid gear train, and additional rotary motor means adapted to drive saidgear train in a direction of rotation opposite to that imparted toit bysaid first mentioned motor, including a spring adapted to be wound up inresponse to actuation of the first mentioned rotor.

10. In combination, work performing members and control means, saidcontrol means including a static torque motor and an actuating circuittherefor, a rotor for said motor, controlled means associated with saidwork performing members and a driving connection between said means andthe rotor, and additional rotary motor means adapted when the actuatingcircuit of the motor is broken,to impart a retrograde movement to saiddriving connection, and resilient stop meansadapted to limit themovement of said controlled arms in response to actuation of the statictorque motor.

' LAURENCE M. PERSONS.

